Dyntopo setting to generate quad faces
Triangles define better areas than quads (details). That's internal. There is a function on object mode, though. Click your object. Enter edit mode. Select all your faces. Press spacebar (I assume you´re on 2.79) and search: Triangles to quads.

You can also use REMESH from the modifiers.
You can also try decimate to reduce the "poly" count.

Maybe this will help you.